Recent work suggested that the reduction in both food intake and body weight observed in response to combined treatment with GLP-1RAs and PYY 3-36 results in synergistically-enhanced activation of discrete hypothalamic and brainstem circuits that regulate appetite, including the arcuate nucleus (ARC), the paraventricular nuclei of the hypothalamus (PVNs), the central nucleus of the amygdala (CeA), and the hindbrain (AP/NTS) 10,12,21,44
In March 2026, Eli Lilly warned that some compounded tirzepatide products have B12 mixed directly into the injection solution, which can create a chemical reaction and unknown impurities
In March 2025, Novo said it agreed to pay up to $2 billion for the rights to an early experimental drug from the Chinese pharmaceutical company United Laboratories International
Some may contain additives like vitamin B12, which are untested for safety or efficacy when combined with semaglutide
Clinical recommendations: Healthcare providers should exercise caution when considering compounded semaglutide for patients
Also discard it if sterility was compromised: unclean septum, reused needle, damaged stopper, or storage outside the documented temperature range
